Azure ExpressRoute - Cisco Meraki MX or directly into LAN?
We are in the process of deploying Azure ExpressRoute across multiple sites via a provider Layer 2 VPLS circuit and are evaluating our CPE options. Our provider is delivering a Layer 2 handoff to each site, meaning we are responsible for all Layer 3 BGP configuration on the customer edge. We currently run a full Cisco Meraki environment — Meraki MX appliances as our edge firewalls and Meraki MS switches on the LAN side — and are wondering if anyone has successfully terminated an ExpressRoute BGP session directly on a Meraki MX, or alternatively terminated it directly into the LAN without a dedicated edge router in between. Terminating ExpressRoute BGP directly on a Meraki MX appliance — is this even possible given Meraki's limited BGP support? Connecting the Layer 2 provider handoff (dot1Q or QinQ) directly into a Meraki MS LAN switch and routing from there — has anyone made this work, and what were the caveats? Running a dedicated CPE router in front of the Meraki MX — and if so, how did you handle the integration between the CPE router and the Meraki SD-WAN fabric, particularly around route advertisement and traffic steering? Our provider model uses QinQ VLAN tagging with a provider-assigned S-tag and customer-defined C-tags for private and Microsoft peering. Since the provider is only delivering Layer 2, all BGP session establishment, prefix advertisement, and routing policy must be handled entirely on our CPE. Our understanding is that Meraki MX does not support QinQ subinterfaces or the level of BGP policy control needed for ExpressRoute, but we wanted to see if anyone has found a creative workaround before we commit to dedicated CPE hardware at each site. Device recommendations welcome: If a dedicated CPE router is the only viable path, we'd also love to hear what devices others have used successfully for this use case. Our circuit is 1Gbps, so we need something that can handle that throughput comfortably with BGP active — but we're a mid-size enterprise and are looking for cost-effective options rather than carrier-grade platforms. What has worked well for you without breaking the budget? Any real-world experience, gotchas, or recommended architectures would be greatly appreciated, especially from anyone running a Meraki-only environment who has tackled this!